Buggy code:
public class PCEnhancer { public static final int ENHANCER_VERSION = 2 ; public static final int ENHANCE_NONE = 0 ; public static final int ENHANCE_AWARE = 2 << 0 ; public static final int ENHANCE_INTERFACE = 2 << 1 ; public static final int ENHANCE_PC = 2 << 2 ; private static final String PRE = "pc" ; private static final Class PCTYPE = PersistenceCapable . class ; private static final String SM = ( PCEnhancer . PRE ) + "StateManager" ; private static final Class SMTYPE = StateManager . class ; private static final String INHERIT = ( PCEnhancer . PRE ) + "InheritedFieldCount" ; private static final String CONTEXTNAME = "GenericContext" ; private static final Class USEREXCEP = UserException . class ; private static final Class INTERNEXCEP = InternalException . class ; private static final Class HELPERTYPE = PCRegistry . class ; private static final String SUPER = ( PCEnhancer . PRE ) + "PCSuperclass" ; private static final Class OIDFSTYPE = FieldSupplier . class ; private static final Class OIDFCTYPE = FieldConsumer . class ; private static final Localizer _loc = Localizer . forPackage ( PCEnhancer . class ) ; private static final PCEnhancer . AuxiliaryEnhancer [ ] _auxEnhancers ; private final BCClass _pc ; private final MetaDataRepository _repos ; private final ClassMetaData _meta ; private final Log _log ; private Collection _oids = null ; private boolean _defCons = true ; private boolean _fail = false ; private File _dir = null ; private BytecodeWriter _writer = null ; private Map _backingFields = null ; private Set _violations = null ; public PCEnhancer ( OpenJPAConfiguration conf , Class type ) { } public PCEnhancer ( OpenJPAConfiguration conf , ClassMetaData type ) { } public PCEnhancer ( OpenJPAConfiguration conf , BCClass type , MetaDataRepository repos ) { } public PCEnhancer ( OpenJPAConfiguration conf , BCClass type , MetaDataRepository repos , ClassLoader loader ) { } public PCEnhancer ( OpenJPAConfiguration conf , BCClass type , ClassMetaData meta ) { } public BCClass getBytecode ( ) { } public ClassMetaData getMetaData ( ) { } public boolean getAddDefaultConstructor ( ) { } public void setAddDefaultConstructor ( boolean addDefaultConstructor ) { } public boolean getEnforcePropertyRestrictions ( ) { } public void setEnforcePropertyRestrictions ( boolean fail ) { } public File getDirectory ( ) { } public void setDirectory ( File dir ) { } public BytecodeWriter getBytecodeWriter ( ) { } public void setBytecodeWriter ( BytecodeWriter writer ) { } public int run ( ) { } public void record ( ) throws IOException { } private void record ( BCClass bc ) throws IOException { } private void validateProperties ( ) { } private static String getSetterName ( FieldMetaData fmd ) { } static BCField getReturnedField ( BCMethod meth ) { } static BCField getAssignedField ( BCMethod meth ) { } private static BCField findField ( BCMethod meth , Instruction template , boolean findAccessed ) { } private void addViolation ( String key , Object [ ] args , boolean fatal ) { } private void processViolations ( ) { } private void replaceAndValidateFieldAccess ( ) { } private void replaceAndValidateFieldAccess ( Code code , Instruction ins , boolean get , Instruction stat ) { } private boolean isBackingFieldOfAnotherProperty ( String name , Code code ) { } private ClassMetaData getPersistenceCapableOwner ( String fieldName , Class owner ) { Field f = Reflection . findField ( owner , fieldName , false ) ; if ( f == null ) return null ; if ( ( ( _meta ) != null ) && ( _meta . getDescribedType ( ) . isInterface ( ) ) ) return _meta ; <START_BUG> return _repos . getMetaData ( _meta . getDescribedType ( ) , null , false ) ; <END_BUG> } private void addPCMethods ( ) throws NoSuchMethodException { } private void addClearFieldsMethod ( ) throws NoSuchMethodException { } private void addNewInstanceMethod ( boolean oid ) { } private void addManagedFieldCountMethod ( ) { } private void addProvideFieldsMethods ( ) throws NoSuchMethodException { } private void addReplaceFieldsMethods ( ) throws NoSuchMethodException { } private void addCopyFieldsMethod ( ) throws NoSuchMethodException { } private int beginSwitchMethod ( String name , Code code ) { } private void addMultipleFieldsMethodVersion ( BCMethod single ) { } private void addStockMethods ( ) throws NoSuchMethodException { } private void translateFromStateManagerMethod ( Method m ) { } private void addGetVersionMethod ( ) throws NoSuchMethodException { } private Class toPrimitiveWrapper ( FieldMetaData fmd ) { } private void addReplaceStateManagerMethod ( ) { } private void addNoOpApplicationIdentityMethods ( ) { } private void addCopyKeyFieldsToObjectIdMethod ( boolean fieldManager ) throws NoSuchMethodException { } private void addExtractObjectIdFieldValueCode ( Code code , FieldMetaData pk ) { } private void addCopyKeyFieldsFromObjectIdMethod ( boolean fieldManager ) throws NoSuchMethodException { } private Boolean usesClassStringIdConstructor ( ) { } private Class unwrapSingleFieldIdentity ( FieldMetaData fmd ) { } private Method getReflectionGetterMethod ( Class type , Class argType ) throws NoSuchMethodException { } private Method getFieldSupplierMethod ( Class type ) throws NoSuchMethodException { } private Method getFieldConsumerMethod ( Class type ) throws NoSuchMethodException { } private void addNewObjectIdInstanceMethod ( boolean obj ) throws NoSuchMethodException { } private Method getStateManagerMethod ( Class type , String prefix , boolean get , boolean curValue ) throws NoSuchMethodException { } private Method getMethod ( Class owner , Class type , String prefix , boolean get , boolean haspc , boolean curValue ) throws NoSuchMethodException { } private Instruction throwException ( Code code , Class type ) { } private void enhanceClass ( ) { } private void addFields ( ) { } private void addStaticInitializer ( ) { } private static byte getFieldFlag ( FieldMetaData fmd ) { } private void addSerializationCode ( ) { } private boolean externalizeDetached ( ) { } private void modifyWriteObjectMethod ( BCMethod method , boolean full ) { } private void modifyReadObjectMethod ( BCMethod method , boolean full ) { } private void addIsDetachedMethod ( ) throws NoSuchMethodException { }

Fix:
return _repos . getMetaData ( f . getDeclaringClass ( ) , null , false ) ;